/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.classfile.attribute.preverification;

import proguard.classfile.*;
import proguard.classfile.attribute.*;
import proguard.classfile.attribute.preverification.visitor.StackMapFrameVisitor;
import proguard.classfile.attribute.visitor.AttributeVisitor;

/**
 * This Attribute represents an exceptions attribute.
 *
 * @author Eric Lafortune
 */
public class StackMapAttribute extends Attribute {
    public int u2stackMapFramesCount;
    public FullFrame[] stackMapFrames;

    /**
     * Creates an uninitialized ExceptionsAttribute.
     */
    public StackMapAttribute() {}

    /**
     * Creates a StackMapTableAttribute with the given stack map frames.
     */
    public StackMapAttribute(FullFrame[] stackMapFrames) {
        this(stackMapFrames.length, stackMapFrames);
    }

    /**
     * Creates a StackMapTableAttribute with the given stack map frames.
     */
    public StackMapAttribute(int stackMapFramesCount, FullFrame[] stackMapFrames) {
        this.u2stackMapFramesCount = stackMapFramesCount;
        this.stackMapFrames = stackMapFrames;
    }

    // Implementations for Attribute.

    public void accept(Clazz clazz, Method method, CodeAttribute codeAttribute, AttributeVisitor attributeVisitor) {
        attributeVisitor.visitStackMapAttribute(clazz, method, codeAttribute, this);
    }

    /**
     * Applies the given stack map frame visitor to all stack map frames.
     */
    public void stackMapFramesAccept(Clazz clazz, Method method, CodeAttribute codeAttribute,
        StackMapFrameVisitor stackMapFrameVisitor) {
        for (int index = 0; index < u2stackMapFramesCount; index++) {
            FullFrame stackMapFrame = stackMapFrames[index];

            // We don't need double dispatching here, since there is only one
            // type of StackMapFrame.
            stackMapFrameVisitor.visitFullFrame(clazz, method, codeAttribute, stackMapFrame.getOffsetDelta(),
                stackMapFrame);
        }
    }
}
